This is a good thread on the nuances of proof-of-work:

Bitcoin mining is vital because it secures a global, open, decentralized money network which tens of millions in failing economies already rely on. Separately—in addition—mining itself has positive externalities, some detailed in this epic thread, others not yet realized ♻️ 🧵

This thread is important in understanding Bitcoin’s energy usage and how it functions.

This is a great thread breaking down how Bitcoin mining helps incentivize renewable energy investments